POLYMER PHYSICS Spring 2001 EXAM III
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EMA 6165
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Part I: Polymer Structure and Properties
1.
Give the appropriate value for each critical temperature that would be required for injection
molding the resin. Mark any space as NA if it is not applicable.
Give a value for
Tg or Tm
whichever is appropriate. (10 pts)
Polymer
Tg
Tm
Poly(ethylene)
Poly(styrene)
Poly(ethylene terephthalate)
Poly(phenylene ether imide)
(Ultem)
Poly(dimethylsiloxane)
Poly(hexamethylene adipamide) (Nylon 6,6)
Poly(vinyl chloride)
Poly(propylene)
Poly(methyl methacrylate)
Poly(bisphenol A carbonate)
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POLYMER PHYSICS - Spring 2001
EMA 6165 - EXAM III
Part II:
Indicate whether the following statements are
TRUE
or
FALSE
.
Give an
explanation if the statement is false.
(10 pts)
1.
Branching decreases the fusion temperature of polyethylene.
2.
Spinodal phase separation processes are characterized by instantaneous precipitation
with small fluctuations in the electron density initially.
3.
The Doolittle equation predicts the molecular retardation rate of chains adsorbing
onto the face of a growing crystal.
4.
The surface energy of a crystal increases linearly with the fold surface energy
5.
The elastic stress scales with the functionality of cross link junctions to the second
power under uniaxial elongation.

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- Spring '08
- Brennan
- Polymer, Trigraph, Ema, Polymer Physics
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